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Elden [556K]
2 years ago
5

Describe why the periodic table needed to be reordered in 1913.

Chemistry
1 answer:
Norma-Jean [14]2 years ago
7 0

Answer:

1913. Henry Moseley determined the atomic number of each of the known elements. He realized that, if the elements were arranged in order of increasing atomic number rather than atomic weight, they gave a better fit within the 'periodic table'.

Explanation:

GOO

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Which of the following chemical compounds contains two hydrogen atoms in every molecule?
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A. Water

Explanation:

H2O means that there are two hydrogen and one oxygen in every water molecule.

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Why is making a peanut pretzel and cereal mixture
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the air pressure from the atmosphere measures 0.5atm at an altitude of 18,000 ft. How much pressure is this in pounds per square
Julli [10]

14.7lb/in²

Explanation:

This is a conversion problem from atm to pounds per square inch

Pressure is the combined force per unit area of substance on another.

Given pressure = 0.5atm

To solve this problem ;

Convert from atm to N/m² to pound per square inch

    1 atm = 101325N/m²

  0.5atm = 0.5 x 101325 = 50,662.5‬N/m²

now we need to convert to pound per square inch;

     1N  = 0.225lb

     1m = 39.37in

Solving;

 101325 Nx \frac{1}{m^{2} }  x \frac{0.225lb}{1N }  x \frac{m^{2} }{39.37in x 39.37in} = 14.7lb/in²

learn more:

Pressure of gases brainly.com/question/10897667

#learnwithBrainly

8 0
3 years ago
If you made a three-dimensional model of an atom and its nucleus, how would you represent the atom? 7th grade
Gemiola [76]

Answer:

it shows the breakdown of the atom

Explanation:

it will show it molecularly

7 0
3 years ago
Which picture or pictures show an element?
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Its both A and C because both A and C have only one type each so it can only be those two :)

5 0
3 years ago
Read 2 more answers
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